Question: Which French killer had the most victims ?
Paraphrase: What killer from France had the most victims?
SPARQL (Wikidata): select ?ent where { ?ent wdt:P31 wd:Q5 . ?ent wdt:P1345 ?obj . ?ent wdt:P103 wd:Q150 } ORDER BY DESC(?obj)LIMIT 5 
Answer: Louis Poirson, Jacques Fruminet, Patrick Tissier, Rémy Roy, Denis Waxin